Quarterly report pursuant to Section 13 or 15(d)

Licenses Acquired - Summary Of Research and Development Arrangement Contract (Detail)

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Licenses Acquired - Summary Of Research and Development Arrangement Contract (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and Development Total $ 83 $ 7,439
Mustang Therapeutics, Inc [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and Development Total 0 2,260
Checkpoint Therapeutics, Inc [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and Development Total 0 2,000
Coronado SO Co, Inc [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and Development Total 0 1,179
Helocyte [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and Development Total 83 0
Avenue Therapeutics, Inc. [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and Development Total $ 0 $ 2,000